J. Mori, Y. Matsuo, H. Koshiba, K. Aihara, and H. Takeda. User Modeling, Adaptation, and Personalization: 17th International Conference, UMAP 2009, formerly UM and AH, Trento, Italy, volume 5535 of Lecture Notes in Computer Science, Springer, Berlin, (2009)
X. Huang, and S. Oviatt. Machine Learning for Multimodal Interaction: Second International Workshop, MLMI 2005, Edinburgh, UK, July 11--13, 2005, Revised Selected Papers, volume 3869 of Lecture Notes in Computer Science, Springer, Berlin, (2006)
S. Watanabe, J. Hershey, Y. Marks, Tim K. Fujii, and Y. Koji. Proceedings of INTERSPEECH 2014, 15th Annual Conference of the International Speech Communication Association, Singapore, page 323-327. (2014)